# RunSybil vs ysoserial: side-by-side comparison (2026)

[RunSybil](https://cybersectools.com/tools/runsybil) is a commercial [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution by [RunSybil](https://cybersectools.com/companies/runsybil). [ysoserial](https://cybersectools.com/tools/ysoserial) is a free [penetration testing](https://cybersectools.com/categories/pentesting-tools) solution. Features, integrations, deployment and the company behind each one, side by side.

## Side-by-side comparison

| | RunSybil | ysoserial |
|---|---|---|
| Pricing model | Commercial | Free |
| Category | Penetration Testing | Penetration Testing |
| Verified | No | No |
| Deployment type | Cloud | On-Premises |
| Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise |
| GitHub stars | – | 8,501 |
| Last commit | – | Mar 2024 |
| Company | RunSybil | – |
| Headquarters | – | – |

### Use cases and capabilities

| | RunSybil | ysoserial |
|---|---|---|
| AI Pentesting | Yes | – |
| Attack Paths | Yes | – |
| Continuous Testing | Yes | – |
| Vulnerability Prioritization | Yes | – |
| Reconnaissance | Yes | – |
| DAST | Yes | – |
| Red Team | Yes | – |
| Security Scanning | Yes | – |
| Vulnerability | Yes | Yes |
| Cloud Native | Yes | – |
| Security Research | – | Yes |
| Payload Generation | – | Yes |

### Core features

**RunSybil**

10 features listed. Sign in on the page to see them.

**ysoserial**

No features listed.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [RunSybil](https://cybersectools.com/tools/runsybil) fits if you want a cloud product.
- [ysoserial](https://cybersectools.com/tools/ysoserial) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product.

## RunSybil vs ysoserial FAQ

Common questions when comparing RunSybil vs ysoserial for penetration testing.

### What is the difference between RunSybil and ysoserial?

**RunSybil**: AI-driven continuous attack surface assessment and validation platform. Built by RunSybil.

**ysoserial**: A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes RunSybil and ysoserial?

**RunSybil** is made by RunSybil. **ysoserial** is open-source with 8,501 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is RunSybil a good alternative to ysoserial?

Often, yes. RunSybil and ysoserial are both Penetration Testing products, and both cover Vulnerability. Key differences: RunSybil is Commercial while ysoserial is Free, ysoserial is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [RunSybil vs AI Pentest Copilot](https://cybersectools.com/compare/ai-pentest-copilot-vs-runsybil)
- [RunSybil vs NetSPI Platform](https://cybersectools.com/compare/netspi-platform-vs-runsybil)
- [RunSybil vs Strike PTaaS](https://cybersectools.com/compare/runsybil-vs-strike-ptaas)
- [ysoserial vs AI Pentest Copilot](https://cybersectools.com/compare/ai-pentest-copilot-vs-ysoserial)
- [ysoserial vs NetSPI Platform](https://cybersectools.com/compare/netspi-platform-vs-ysoserial)
- [ysoserial vs Strike PTaaS](https://cybersectools.com/compare/strike-ptaas-vs-ysoserial)

## Alternatives to each

- [See all RunSybil alternatives](https://cybersectools.com/alternatives/runsybil)
- [See all ysoserial alternatives](https://cybersectools.com/alternatives/ysoserial)

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Source: https://cybersectools.com/compare/runsybil-vs-ysoserial

For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/runsybil.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md.

More on RunSybil and ysoserial: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md